If NULL is passed to _copy, return NULL with no warning. If NULL is passed

2006-02-06  Behdad Esfahbod  <behdad@gnome.org>

        * pango/pango-utils.c (pango_matrix_copy, pango_matrix_free):  If
        NULL is passed to _copy, return NULL with no warning.  If NULL is
        passed to _free, do nothing with no warning.  Docs updated.

        * examples/viewer-pangoxft.c (render_callback): Multiply x,y by
        PANGO_SCALE, as pango_xft_render_layout takes coordinates in
        Pango units weirdly enough.

        * viewer-pangocairo.c (render_callback): Do cairo_translate, to
        draw correct bounding boxes for x,y nonzero.

        * examples/renderdemo.c (do_output): If context has an all-zero matrix
        set, interpret it as backend does not support transformation, so
        warn on --rotate, and do not try to rotate.

        * examples/viewer-pangox.c (pangox_view_get_context): Set an all-zero
        matrix on context, to negotiate that we don't support transformations.

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